Flange fixing structure and gate valve

Abstract

The utility model relates to a kind of flange fixing structure and a gate valve in the technical field of fluid sensor, including valve body and connecting pipeline, the both ends of valve body are all set with the connecting port of butt joint with connecting pipeline, the inner ring of second flange part is equipped with the convex ring that protrude to outside side, when first flange part and second flange part butt joint, connecting pipeline can be sleeved in the middle part of convex ring, the periphery of convex ring is equipped with several convex buckles, convex buckle extends to the inner wall of first flange part by convex ring, the inner wall of first flange part is set with the buckle groove matched with convex buckle, convex buckle and buckle groove are fixed by buckling, the connection stability between valve body and connecting pipeline can be kept, effectively withstand the fluid pressure between valve body and connecting pipeline, avoid the separation between valve body and connecting pipeline.

Description

Technical Field

[0001] This utility model relates to the field of fluid sensor technology, and in particular to a flange fixing structure and a gate valve. Background Technology

[0002] A gate valve is an opening and closing element consisting of a gate. The gate's movement is perpendicular to the fluid direction. Gate valves can only be fully open or fully closed; they cannot be used for regulation or throttling. Gate valves achieve sealing through the contact between the valve seat and the gate. Typically, a metal material is welded onto the sealing surface to increase wear resistance.

[0003] The existing Chinese invention patent with publication number CN114542741B discloses a gate valve, relating to the field of valve technology, which solves the technical problem of leakage caused by severe wear of the sealing surface on one side of the gate due to a fluid pressure difference on both sides of the gate. This gate valve includes a valve body, a valve stem, and a gate connected to one end of the valve stem for blocking or opening the fluid passage within the valve body. The valve stem passes sequentially through a bracket and a cylinder connected to the valve body. A switching element is connected to the valve stem, and a limiting part is provided within the bracket, forming a switching gap with the top of the bracket's inner cavity. When the gate valve is opened, the switching element can only move vertically along the limiting part to restrict the valve stem's vertical movement. When the gate rises into the cylinder and the switching element rises into the switching gap, the valve stem can rotate under external force, thus achieving the switching of the inlet and outlet sealing surfaces when the gate descends to the position blocking the fluid passage. This prevents wear on only one side of the gate's sealing surface due to the fluid pressure difference on both sides of the gate, preventing gate valve leakage.

[0004] However, existing gate valves have flanged pipe connections at both ends of the valve body. These flanges are typically secured with threaded connections (hole-to-hole) using connecting nuts. When the bolts loosen, the fluid pressure inside the pipe can easily force the valve body off the pipe. Therefore, there is an urgent need to develop a flanged fixing structure and a gate valve to meet practical application requirements. Utility Model Content

[0005] The purpose of this invention is to provide a flange fixing structure and a gate valve to solve the above-mentioned defects.

[0006] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0007] A flange fixing structure includes a valve body and a connecting pipe. Both ends of the valve body have connection ports that mate with the connecting pipe. A first flange portion is provided around the periphery of the connection port, and a second flange portion is provided at the end of the connection port near the connection port. The inner ring of the second flange portion has an outwardly protruding ring with a diameter smaller than the aperture of the connection port. When the first flange portion and the second flange portion are mated, the connecting pipe can be fitted onto the middle of the protruding ring. The periphery of the protruding ring has several protruding buckles that extend through the protruding ring to the inner wall of the first flange portion. The inner wall of the first flange portion has a buckle groove that matches the protruding buckle, and the protruding buckle and the buckle groove are engaged and fixed.

[0008] As a further embodiment of the above description, the buckle includes a back buckle and an extension rib. One end of the extension rib is integrally formed with the buckle ring, and the back buckle is located at the end of the extension rib away from the buckle ring.

[0009] In the above description, as a further solution, the undercut part is inclined to the outside of the convex ring, the outside of the undercut part is an outwardly convex arc surface structure, and the cross-sectional structure of the buckle groove is an arc groove that matches the undercut part.

[0010] A gate valve includes the valve body described above. The valve body has a gate plate that can move up and down inside. The top of the valve body has a insertion groove in which the gate plate is movably inserted. The insertion groove extends to the connection ports at both ends of the valve body. The top of the valve body has a valve stem for driving the gate plate to move up and down.

[0011] As a further embodiment of the above description, a recessed groove is provided on the top of the valve body. The recessed groove is located around the insertion groove. A sealing element is provided inside the recessed groove. The gate plate passes through the sealing element and is inserted into the insertion groove. A pressure seat is also provided on the top of the sealing element. The two sides of the pressure seat are fixedly connected to the valve body by bolts. The pressure seat abuts against the top of the sealing element.

[0012] As a further embodiment of the above description, the valve body is provided with a fixed seat at the top, and a valve stem nut is provided at the center of the fixed seat. The valve stem nut is fixedly connected to the top of the valve body through the fixed seat, and the middle part of the valve stem is threadedly connected to the valve stem nut.

[0013] As a further option, the valve stem nut is equipped with a handwheel at its top, as described above.

[0014] Compared with the prior art, the beneficial effects of this utility model are as follows: the inner ring of the second flange is provided with a protruding ring that protrudes outward, and the circumference of the protruding ring is provided with several protruding buckles. When the first flange and the second flange are connected, the protruding buckles extend to the inner wall of the first flange through the protruding ring. The inner wall of the first flange is provided with a buckle groove that matches the protruding buckle. The protruding buckle and the buckle groove are fastened and fixed, which can maintain the connection stability between the valve body and the connecting pipe, effectively withstand the fluid pressure between the valve body and the connecting pipe, and prevent the valve body and the connecting pipe from separating. Attached Figure Description

[0015] Figure 1 This is an exploded view of the flange fixing structure described in this embodiment;

[0016] Figure 2 for Figure 1 A partially enlarged structural diagram of A in the middle.

[0017] Figure 3 This is a three-dimensional structural diagram of a gate valve described in this embodiment;

[0018] Figure 4 This is an exploded view of the structure of a gate valve as described in this embodiment;

[0019] Figure 5 This is a cross-sectional view of a gate valve as described in this embodiment;

[0020] In the diagram: 1-valve body, 11-connection port, 111-slot, 12-insertion slot, 13-sunken groove, 2-connecting pipe, 3a-first flange, 3b-second flange, 4-convex ring, 41-convex snap, 411-back buckle, 412-extension rib, 5-gate, 6-valve stem, 7-handwheel, 8-fixed seat, 81-valve stem nut, 9-seal, 91-pressure seat. Detailed Implementation

[0021] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0022] For this embodiment, please refer to Figures 1-5The flange fixing structure specifically implemented includes a valve body 1 and a connecting pipe 2. Both ends of the valve body 1 are provided with connection ports 11 that mate with the connecting pipe 2. A first flange portion 3a is provided around the periphery of the connection port 11. A second flange portion 3b is provided at one end of the connection port 11 near the connection port 11. The inner ring of the second flange portion 3b is provided with a protruding ring 4 that protrudes outward. The diameter of the protruding ring 4 is smaller than the aperture of the connection port 11. When the first flange portion 3a and the second flange portion 3b are mated, the connecting pipe 2 can be sleeved on the middle part of the protruding ring 4. Several protruding buckles 41 are provided around the periphery of the protruding ring 4. The protruding buckles 41 extend through the protruding ring 4 to the inner wall of the first flange portion 3a. The inner wall of the first flange portion 3a is provided with a buckle groove 111 that matches the protruding buckle 41. The protruding buckle 41 and the buckle groove 111 are fastened and fixed.

[0023] The inner ring of the second flange 3b has a protruding ring 4 that protrudes outward, and the periphery of the protruding ring 4 has several protruding buckles 41. When the first flange 3a and the second flange 3b are connected, the protruding buckles 41 extend through the protruding ring 4 to the inner wall of the first flange 3a. The inner wall of the first flange 3a has a buckle groove 111 that matches the protruding buckle 41. The protruding buckle 41 and the buckle groove 111 are fastened and fixed, which can maintain the connection stability between the valve body 1 and the connecting pipe 2, effectively withstand the fluid pressure between the valve body 1 and the connecting pipe 2, and prevent the valve body 1 and the connecting pipe 2 from separating.

[0024] Specifically, such as Figure 2 and Figure 5 As shown, the buckle 41 includes a buckle portion 411 and an extension rib 412. One end of the extension rib 412 is integrally formed with the protruding ring 4. The buckle portion 411 is located at the end of the extension rib 412 away from the protruding ring 4. The buckle portion 411 is inclined to the outside of the protruding ring 4. The outside of the buckle portion 411 is an outwardly protruding arc surface structure. The cross-sectional structure of the buckle groove 111 is an arc-shaped groove that matches the buckle portion 411.

[0025] A gate valve includes the valve body 1 described above. The valve body 1 has a gate 5 that can move up and down inside. The top of the valve body 1 has a insertion groove 12, in which the gate 5 is movably inserted. The insertion groove 12 extends to the connection ports 11 at both ends of the valve body 1. The top of the valve body 1 has a valve stem 6, which is used to drive the gate 5 to move up and down. The top of the valve stem nut 81 has a handwheel 7.

[0026] Specifically, such as Figure 4As shown, a recessed groove 13 is provided on the top of the valve body 1. The recessed groove 13 is located around the insertion groove 12. A sealing element 9 is provided inside the recessed groove 13. The gate 5 passes through the sealing element 9 and is inserted into the insertion groove 12. A pressing seat 91 is also provided on the top of the sealing element 9. The two sides of the pressing seat 91 are fixedly connected to the valve body 1 by bolts. The pressing seat 91 abuts against the top of the sealing element 9. A fixing seat 8 is provided on the top of the valve body 1. A valve stem nut 81 is provided at the center of the fixing seat 8. The valve stem nut 81 is fixedly connected to the top of the valve body 1 through the fixing seat 8. The middle part of the valve stem 6 is threadedly connected to the valve stem nut 81.

[0027] An installation process for a gate valve: Align and sleeve the convex ring 4 of the second flange 3b with the connection port 11 of the first flange 3a, then rotate the valve body 1 so that the connection holes of the second flange 3b and the first flange are aligned. At this time, the convex buckle 41 extends through the convex ring 4 to the inner wall of the first flange 3a. The inner wall of the first flange 3a has a buckle groove 111 that matches the convex buckle 41. The convex buckle 41 and the buckle groove 111 are fastened and fixed, which can effectively maintain the connection stability between the valve body 1 and the connecting pipe 2, effectively withstand the fluid pressure between the valve body 1 and the connecting pipe 2, and prevent the valve body 1 from separating from the connecting pipe 2.

[0028] The above description, in conjunction with specific preferred embodiments, provides a further detailed explanation of the present invention. It should not be construed that the specific implementation of the present invention is limited to these descriptions. For those skilled in the art, various simple deductions or substitutions can be made without departing from the concept of the present invention, and all such modifications and substitutions should be considered within the scope of protection of the present invention.

Claims

1. A flange fixing structure, comprising a valve body and a connecting pipe, characterized in that: Both ends of the valve body are provided with connection ports for connecting pipes. A first flange is provided around the periphery of the connection port, and a second flange is provided at the end of the connection port near the connection port. The inner ring of the second flange is provided with a protruding ring that protrudes outward. The diameter of the protruding ring is smaller than the aperture of the connection port. When the first flange and the second flange are connected, the connecting pipe can be sleeved on the middle of the protruding ring. Several protruding buckles are provided around the periphery of the protruding ring. The protruding buckles extend through the protruding ring to the inner wall of the first flange. The inner wall of the first flange is provided with a buckle groove that matches the protruding buckle. The protruding buckle and the buckle groove are fastened and fixed.

2. The flange fixing structure according to claim 1, characterized in that: The buckle includes an undercut portion and an extension rib. One end of the extension rib is integrally formed with the protruding ring, and the undercut portion is located at the end of the extension rib away from the protruding ring.

3. The flange fixing structure according to claim 2, characterized in that: The undercut portion is inclined to the outside of the convex ring, and the outside of the undercut portion is an outwardly convex arc surface structure. The cross-sectional structure of the buckle groove is an arc-shaped groove that matches the undercut portion.

4. A gate valve, comprising the valve body as described in any one of claims 1-3, characterized in that: The valve body has a gate that can move up and down inside. The top of the valve body has a slot for insertion, and the gate is movably inserted into the slot. The slot extends to the connection ports at both ends of the valve body. The top of the valve body has a valve stem for driving the gate to move up and down.

5. A gate valve according to claim 4, characterized in that: The valve body has a recessed groove at the top, which is located around the insertion groove. A sealing element is provided inside the recessed groove. The gate plate passes through the sealing element and is inserted into the insertion groove. A pressure seat is also provided at the top of the sealing element. The two sides of the pressure seat are fixedly connected to the valve body by bolts, and the pressure seat abuts against the top of the sealing element.

6. A gate valve according to claim 4, characterized in that: The valve body is provided with a fixed seat at the top, and a valve stem nut is provided at the center of the fixed seat. The valve stem nut is fixedly connected to the upper part of the valve body through the fixed seat, and the middle part of the valve stem is threadedly connected to the valve stem nut.

7. A gate valve according to claim 6, characterized in that: A handwheel is provided at the top of the valve stem nut.

Images